Arm rest



FIG. 1 is a perspective view of an arm rest, showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view; and,

FIG. 5 is a side elevational view, the opposite side being a mirrorimage thereof.

The ornamental design for a arm rest, as shown and described.